Subject: Re: direct I/O again
To: Chuck Silvers <email@example.com>
From: Bill Studenmund <firstname.lastname@example.org>
Date: 03/27/2006 19:36:48
Content-Type: text/plain; charset=us-ascii
On Mon, Mar 27, 2006 at 07:23:34PM -0800, Bill Studenmund wrote:
> On Mon, Mar 27, 2006 at 07:57:50AM -0800, Chuck Silvers wrote:
> > hi folks,
> > I've finished the initial implementation of direct I/O,
> > there's an updated diff in:
> > ftp://ftp.netbsd.org/pub/NetBSD/misc/chs/dio/diff.directio.3
> Could you please move the branch base tag after updates? :-) You seem to=
> have some vmspace changes showing up as diffs, when I expect they are=20
> already in the main tree.
> I'm still looking at the substance of the changes.
Ok, I looked at the substance of it, and it seems fine.
I'm actually quite interested in your mentioning support for cuncurrent=20
writes. What did you have in mind for that?
The two things I see that are needed are:
1) some way to handle keeping the writes out of each others' way. An=20
extent map comes to mind...
2) how do we keep potential allocations out of each others' way? i.e.=20
fine-grained locking on changing the block allocation tables. ??
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